Carrier HH18HA282 Thermostat/Sensor

The Carrier HH18HA282 is a high-precision defrost thermostat sensor engineered for Carrier, Bryant, and Payne heat pump systems. This OEM replacement part, also identified by manufacturer number 3NT01L-04002, is a critical tube-mount sensor designed to monitor evaporator coil temperatures. Operating on an L80-50 logic, the switch is calibrated to open at 80°F and close at 30°F, ensuring the defrost cycle triggers only when frost accumulation threatens system heat transfer efficiency. For technicians, this 10k ohm thermistor (at 77°F) provides the reliable NTC resistance feedback needed by the defrost control board to prevent coil icing. By maintaining accurate temperature sensing, the HH18HA282 protects the compressor from liquid slugging and keeps residential air conditioning and heating units operating within factory technical specifications. Replace failing sensors showing open circuit or short circuit faults to resolve HVAC error codes and restore system performance in demanding refrigeration and HVACR environments.

Key Benefits:

• Optimized Defrost Cycles: Precise L80-50 temperature calibration prevents premature or delayed defrosting, maximizing energy efficiency.
• Broad Compatibility: Direct OEM replacement for Carrier, Bryant, and Payne 38AYC, 38BYC, and 38EYA series heat pumps.
• Reliable Construction: Robust tube-mount design ensures high-quality thermal contact for accurate evaporator coil monitoring.
• System Protection: Reduces ice buildup on outdoor coils, preventing compressor strain and maintaining consistent HVACR performance.

Common Questions:

• How do I test the HH18HA282 sensor? Use a multimeter to check resistance; at 77°F (25°C), the 10k ohm thermistor should read approximately 10,000 ohms.
• What are the symptoms of a faulty defrost sensor? Common signs include a completely iced-over outdoor coil, the unit stuck in cooling mode during winter, or specific defrost board error codes.
• Is this part compatible with my specific heat pump? This HH18HA282 is designed for Carrier family brands; verify your model number against the L80-50 specification before installation.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.